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Many times a user will want to locate and trace a line that is not capable of
carrying electric current This kind of line is referred to as “non conductive”
In the case of non conductive lines the user may insert a small often self
contained transmitter that creates a locating field only around its own
position Such a transmitter is often referred to as a “sonde” (English:
“sender”)
These coil type transmitters
emanate a magnetic field that has
a well defined shape or pattern
They are typically cylindrical in
shape and battery operated
Most often they are inserted
inside a non metallic line or
conduit in order to find specific
locations of points within the line
A common application of this
technique is to find the location
of a diagnostic camera head used
in the plumbing and rooter
industry Among the items of
information that can be learned
from locating the sonde are the
depth and the direction of travel
of the conduit or line
The Triad
Receiver employs a unique technology to determine the
location of the sonde This technology allows the user to know immediately
the location depth and orientation of the sonde The technology is unlike
traditional "peak and null" methods for sonde locating in that it does not rely
on the use of a directional antenna to find tell tale points around the sonde
Therefore the technique is not limited by unusual or unanticipated
orientations of the sonde
Nonetheless it is important for the user to understand some simple
guidelines First the ANR generally corresponds to the nearness of the
“pointer” antenna to the sonde Second there is a case where the user must
exercise care when locating a sonde When the sonde appears as a flat
rectangle on the screen it is possible that the pointer antenna is not pointing
directly at the sonde The remedy to this is found in step (d) of section [ ]
“Locate the Sonde” a little later in this manual
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Sondes vary in size and shape as well as in usage As mentioned above many
sondes are stand alone battery operated devices and may be of various
frequencies Some sondes are powered through a wire that runs down a
snake or a pushrod Still others are integrated into more elaborate devices
like diagnostic pipeline cameras
